Grass valley 8921ADT DATASHEET

16 8921ADT Four-Channel Audio A-to-D Converter w/Delay Tracking

Key Features

•User-selectable 48 kHz or 96 kHz sampling rates

•24-bit ADC A-to-D conversion

•>105 dB “A” weighted signal-to-noise ratio

•Independent control of each audio channel including channel pairing, level adjustment, swapping, summation, phase inversion, delay up to 1.5 seconds, test tone generation

•Auto tracking delay of video frame synchronizers (8900FSS, 8981FS)

•Four inputs, two pairs of balanced High Z analog audio inputs:

—Supports levels up to +30 dBu

•Looping reference input supports NTSC/ PAL color black, AES signal, 48 kHz or 96 kHz DARS

•Options:

—8900-A-CBL package of four cables, breakout cable package converts threepin balanced AES audio to dual 75Ω BNCs, unbalanced AES audio

—8900-GFA-CBL package of four cables, breakout cable package for GeckoFlex 8900A-R rear module with three-terminal to dual BNCs converts balanced AES audio to dual 75Ω, unbalanced AES audio

Specifications

Supported Frame Types

GeckoFlex with 8900A-R GeckoFlex Audio rear module, Gecko audio frames: 8900TX-A, 8900TF-A, 8900TFN-A

Power Rating

4.7 Watts – single slot

Analog Inputs

Number of inputs: Four balanced Impedance: >22 kΩ

Common mode input voltage: 20V maximum

Connector: Three-pin mini-terminal strip

Reference Input

Number of inputs: One differential loop-through Impedance: High Z loop-through

Input return loss: >40 dB 100 kHz to 10 MHz @ 75Ω

Common mode input voltage: ±1V maximum

The 8921ADT provides conversion of four channels of analog audio to two digital audio streams. In addition to conversion, it offers two forms of delay. These delays are summed—a fixed delay of up to 1.5 seconds and a variable delay based on a signal from video decoders fitted with frame synchronizers or directly from a frame sync card, enabling adjustment for large, fixed lip sync errors while continually adjusting audio delay to match video delay created by the frame synchronizer. Operational modes allow modification to the outgoing signal, such as levels, channel swapping, channel summing, and phase inversion plus channel pairing for the digital audio streams. Many adjustments to this card can be performed directly on the module card-edge controls, while a few of the more complex adjustments require the Web-based interface or the Newton control panel.

Pin 3	+		G	Pin 1
Pin 2	_	8900A-R	_	Pin 2
Pin 1	G	J1	+	Pin 3

	AES 1-1	J2	AES 2-1
	AES 1-2	J3
		J4	AES 2-2
	AES 1-3	J5	AES 2-3
		J6
	Audio In 1	J7	Audio In 2
		J8
	Audio In 3	J9	Audio In 4
	Tracking Input	J11	Tracking Output
	(J5 to pins 2-3)		(J6 to pins 2-3)
	or AES 1 Out	J12	or AES 2 Out
	(J5 to pins 1-2)		(J6 to pins 1-2)
	Looping	J13
	Reference Input	J14

Loopthru

					Unbalanced AES 1/
					Tracking Input
	Audio
	Input 1
			Audio		Balanced
	Audio			Gain,	AES 1
		A-to-D	Processing
	Input 2	Conversion	Sum	Delay
				and Pairing
			Swap		Unbalanced AES 2/
			Invert
	Audio				Tracking Input
			Etc.
	Input 3
	Audio				Balanced
					AES 2
	Input 4

Reference

Input

Ethernet LEDs

Ordering Information

Digital Outputs

Number of outputs: Three balanced and one unbalanced per channel

Signal type:

•Balanced:AES-3id-1992

•Unbalanced:AES-3id-2001

Output voltage level:

•Balanced: 3 Vp-p ±0.2V @ 110Ω

•Unbalanced: 1 Vp-p ±0.2V @ 75Ω

Output impedance:

•Balanced: 110Ω

•Unbalanced: 75Ω

Connector type: Three-pin mini-terminal strip Sample rate: 48 kHz or 96 kHz jumper selectable

This module can be mounted in a GeckoFlex frame when ordered with the 8900A-R GeckoFlex Audio Rear module.

8921ADT

Four-channel audio analog-to-digital converter with delay tracking

8900-A-CBL (Gecko Frames only)

Package of four three-terminal to dual BNC cables, used for unbalanced outputs on modules in a Gecko frame

8900-GFA-CBL (GeckoFlex Frames only)

Package of four three-terminal to dual BNC cables, used for unbalanced outputs on 8900A-R modules in a GeckoFlex frame

For detailed specifications, installation, and setup instructions see: www.grassvalley.com/docs/modular